Hello and welcome to Just Answer. My name isXXXXX for the delay, we may be having a technical issue with the chat function.
So, first off, two things. Can you supply the VIN for me and also is this your personal vehicle, or are you a tech at a repair facility?
The reason I ask is that the phasers and the converters are most likely covered under emissions warranty. I can check that for you with the VIN.
The cam phasers are very susceptible to sticking and usually fail due to oil maintenence issues or oil supply problems.
These engines are notorious for phasers and VCT solenoids sticking from oil feed problems to the cylinder heads. The bad or sticking phaser or VCT solenoid is usually the result of the problem not the root cause. Here is a list of what I check or replace on these every time I get one in with phaser noise, VCT codes, cam sensor codes or misfires caused by VCT issues. Before any disassembly the PCM data pids for VCT error correction should be monitored to confirm it is a VCT issue. If the vehicle won't run, a compression test can also verify the VCT problem.
In short if I don't find oil pressure concerns and my cams are in good shape I usually replace the phasers, VCT bodies, oil pump and tensioners on every one of these. Ford has updated these part numbers several times with improved engineering designs.
For the misfire, I have never heard of a catalyst causing a single cylinder misfire. Ford updated the spark plugs to correct misfire issues. It would be a good idea to physically remove the plug and inspect the electrode.
Usually if a converter has failed, it is due to contamination. It is important to leak test the injectors if a converter is suspected to have an issue.
Since the phasers control timing, they can be covered under emissions warranty if the problem is just sticking phaser(s) (and the converters if there is an issue) Emissions warranty is different from the new vehicle warranty and for your 07 the coverage was either 7 years 70,000 miles, or 8/80,000. The VIN can tell us that when you get a chance.
You are correct about the location of #5 cylinder and the right bank for p0012 dtc.
For restricted catalysts, the easy check is just to loosen the nuts to the manifolds and drive it. This only really works if plugged pretty well. We usually remove an oxygen sensor and check for vacuum while briefly performing a wide open throttle.
I don't suspect the misfire code is caused by the exhaust, or the VCT code.
Hello again, Aaron. The oil pressure really needs to be checked with a manual pressure guage, because the instrument cluster guages are voltage regulated, meaning if the oil pressure is 14 or 90 psi, it will show at the default 1/3-1/2 position. Otherwise, every time the rpm changed the oil pressure guage would fluctuate and the owner might become concerned (if this was an true pressure guage).
If your scanner can read live sensor data, you want to look at VCTADV 1 and 2, and VCTDES 1 and 2 to compare.
I'm having a bit of trouble getting the VIN to match parts coverage. The Ford webpage may be having difficulties. I'll try again in a bit.
I always use the OE diagnostic equipment and I'm not too familiar with the many aftermarket testers specifically.
Usually there will be codes for coil circuit a,b,c failures with electrically related concerns with the coils. Not all the time, though.
To verify the injector pulse, yes, a noid light is the easiest way.
If you run a compression test, run it with the engine disabled so it won't start, then do a
running compression test also. Usually one or the other is able to identify a valve train issue.
The PCM will add fuel to try to help out a cylinder that is misfiring, you're right there also.
You want to check the oil pressure at the oil filter housing. Remove the oil pressure switch which is screwed into the housing right behind the filter and put the guage in there.
Yes, it might be less hassle and cost effective in the long run to have the dealer run a few tests with their equipment.
Ok, I think I hit on all of those questions. Ford site is still down, there's a message there about updating the servers. I have the VIN stored on our post here, so I'll keep trying it periodically.